Development of a Technique for Using Oil Viscosity to Reduce Noise Radiated from the Oil Pan

We have developed a vibration damping technique for the Oil Pan to reduce radiation noise. This technique makes use of oil viscosity. To increase vibration damping of oil pan, we use oil viscosity by forming a thin oil film between the oil pan bottom and an added inner plate. This paper presents the results of vibration tests that were conducted to study the oil damping mechanism and results of applying to a small high-speed diesel engine.